Thermal circuit-closer



1. .SAHLIN.

' THERMAL CIRCUIT CLOSER.

APPLICATION FILED MAR. 22, 1918.

1,3 6,28 Q Patented Jan. 18 1921.

UNITED STATES JOHN SAHLIN, OF CHICAGO, ILLINOIS.

THERMAL CIRCUIT-CLOSER.

Specification of Letters Patent. Patented J an, 18, 1921,

Application filed larch 22, 1918. Serial No. 223,987.

To all whom it may concern:

Be it known that I, JOHN SAHLIN, a citizen of the United States;residing at Chicago, in the county of (Jock and State of Illmois, haveinvented certain new and useful Improvements in Thermal Circuit-Closers; and I do hereby declare the following to be a full, clear, andexact descrlptlon of the 1I1V8I1t1011,- such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to a thermostator a heat regulator forcontrolling tempera-v ture and has for one of its objects the rovisionof. a device of this character W ich will efiiciently control theheating source so that a substantially even temperature ma be obtained.

nother object of this invention is to provide a-novel thermostaticelement adapted to complete an electric circuit to a motor for actuatingor controlling the heating source,

when the heat increases and decreases beyond a given degree.

A further ob ect of this invention is the provision of means forincreasing and decreasing the movement of the thermostatic elementbetween the contacts when exposed to alternating changes'of temperature.

A further object of this invention is the provision of a thermal circuitcloser'of the above stated character, which shall be simple, durable andefficient, and which may be manufactured and sold at a comparatively lowcost. 7

With these and other objects in view as will become more apparent as thedescrip tion proceeds, the invention consists in certain novel featuresoff-construction, combination and arrangement of parts, as will behereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawin s, in which igure 1 isa plan View of a thermal circuit closer constructed in accordance withmy invention,

Fig. 2 is a side elevation of the same, Fig. 3 is a lon itud'inalsectional view illustrating the ad ustment ofthe contacts. Referring indetail to the drawings, the numeral 1 indicates a base of a skeletonformation having oppositely'disposed ears 2 formed thereon which carrybolts 3. The

bolts '3 have mounted thereon a clamp 4 which is adapted to secure thebase 1 about a pipe or other heating source. A bridge 6 1s p1votallymounted upon a member 7 car- -ried b upstanding ears 8 formed upon oneend 0 the base and the bridge has one end of a thermostatic element 9secured thereto by fasteners 10. -The thermostatic element 9 ispreferably constructed of brass and steel or may be constructed of anyother two metalsof different. expansion qualities and is in theformation of a question mark so as to increase the action or expansionmovement of the same. The free end of the thermostatic element 9hassecured thereto 0ppositely disposed platinump'oints 11 which are adaptedto cooperate with contact points 12 and 13 for completing an electriccircuit. The contact point 12 is carried by a plate 14 mounted upon astruck up extension 15 of the base 1 and insulated therefrom, binsulating material 16. A similar plate 17 is dis osed over the plate 14and insulated there rom by insulating material 18 and has threadedthereto an adjusting bolt or screw 19 on which the contact point 13 isformed. The plates 14 and 17 are secured upon the extension 15 bymeansof a 'bolt 20 which is insulated from the plate 17 by insulatingmaterial 21. By having the contact 13 carried by the adjusting screw orbolt 19 provides a construction wherein the distance between thecontacts 12 and 13 may be varied as desired.

A forwardly extending arm 22 is formed upon one end of the bridge 6 andhas piv0t ed thereto an indicating arm 23 b a bolt 24. The free end ofthe arm 22 is bi urcated as illustrated at 25 to receive an eccentricscrew 26 for the purpose of adjusting the indicatin arm 23 in relationto the arm 22 when deslred.

A scale plate 27 is secured to the forward end of the base 1 and hasengraved thereon" degrees ranging preferably from 140 degrees to 180degrees Fahrenheit. The free end of the indicating arm 23 is disposedover the scale plate 27 so that the operatorof the device may readilyadjust the locationof the same on the scale so as to set the thermostatto a correct predetermined temperature. The indicating arm 23 has anenlarged portion 28 formed thereon which is provided with an elongatedslot 29 to receive a shoulder V 30 formed upon an adjusting nut 31. Theadjusting nut 31 is threaded upon a bolt 32 carried by the base, whichwhen turned in i either direction causes the indicating arm 23, arm 22and the thermostatic element 9 to move in corresponding directions, andvaries the position of the thermostatic element in relation to contacts12 and 13.

The plate 17 has secured thereto a binding post 33 to which a conductor34: is connected. A similar binding post 85 is connected to the plate 14and has connected thereto a conductor 36. A binding post 37 is carriedby the base 1 and hasconnected thereto a conductor 38.

1 construction,

- ment of parts maybe made without depart- While I have shown anddescribed the,

preferred embodiment of my invention, it willbe understood that minorchanges in combination, and arrange.-

ing from the spirit and. vention, as claimed.

Having thus described my invention, what scope of the in- 7 for varyingthe position of the thermostatic element between the contacts.

2. A thermal circuit closer comprising a skeleton base, a bridge pivotedto said base, a thermostatic element carried by said bridge, and havingan arcuate-shaped intermediate portion, base contacts carried by saidbase and having the free end of the thermostatic element positionedtherebetween, an arm carried by said bridge and having its free endbifurcated, an indicating arm pivoted to said arm and associated with ascale, and an eccentric screw carried by the indicating arm and disposedwithin the bifurcation of the first named arm for adjusting theindicating arm in relation to the first named arm.

3. A thermal circuit closer comprising a JOHN SAHLIN.

Witnesses:

H. SENGSTEINER, P. E. LARRABEE.

